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Short-term Borrowings and Long-term Debt (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Short-term Debt $ 0 $ 40
Line of Credit Facility, Maximum Borrowing Capacity $ 600 600
Debt Instrument, Term 5 years  
Product Financing Arrangement [Member]    
Short-term Debt $ 0 40
Line of Credit [Member]    
Percentage on limitation of debt to total capitalization under covenant 65.00%  
Ratio of Indebtedness to Net Capital 0.325  
Revolving Credit Facility [Member]    
Loans Outstanding $ 0 0
Letter of Credit [Member]    
Loans Outstanding 2 2
Commercial Paper [Member]    
Loans Outstanding $ 0 $ 219 [1]
Debt, Weighted Average Interest Rate   0.81%
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.25%  
[1] Weighted average interest rate was 0.81% as of December 31, 2015